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CVE-2026-20936 Microsoft CVE debrief

The CVE-2026-20936 vulnerability is an out-of-bounds read issue in Windows NDIS. An authorized attacker could exploit this vulnerability with a physical attack to disclose sensitive information. The vulnerability has a CVSS score of 4.3 and a CVSS vector of CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. Affected products include Windows 10, Windows 11, and Windows Server versions. This vulnerability is particularly concerning because it allows an attacker with physical access to a system to potentially disclose sensitive information. System administrators and security teams should be aware of this vulnerability and take necessary defensive actions to mitigate its impact.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

System administrators and security teams responsible for Windows systems, especially those with physical access to sensitive machines, should be aware of this vulnerability and take necessary defensive actions. This includes reviewing and updating incident response plans, inventorying and verifying affected Windows systems, and applying vendor patches or updates. Additionally, operators of Windows-based systems and platforms should be aware of the potential impact of this vulnerability and take steps to mitigate its effects.

Technical summary

The CVE-2026-20936 vulnerability is an out-of-bounds read issue in Windows NDIS. An authorized attacker could exploit this vulnerability with a physical attack to disclose sensitive information. The vulnerability has a CVSS score of 4.3 and a CVSS vector of CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. Affected products include Windows 10, Windows 11, and Windows Server versions. The vulnerability is caused by a lack of proper bounds checking in the NDIS, which allows an attacker to access sensitive information.

Defensive priority

Medium-priority defensive actions are recommended due to the CVSS score of 4.3 and the potential for information disclosure.

Recommended defensive actions

  • Inventory and verify affected Windows systems
  • Apply vendor patches or updates
  • Monitor for potential physical attacks
  • Implement compensating controls for sensitive data
  • Review and update incident response plans

Evidence notes

The CVE-2026-20936 record indicates an out-of-bounds read vulnerability in Windows NDIS, which could allow an authorized attacker to disclose information with a physical attack. The CVSS score is 4.3, and the CVSS vector is CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. Affected products include various versions of Windows 10, Windows 11, and Windows Server. The evidence is based on the official CVE record and NVD detail. However, the exact scope of affected products and the potential impact on different systems is not fully clear. Further verification is needed to determine the extent of the vulnerability.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:20.653Z and has not been modified since then.